There are a few related questions, but I can't find an answer that works.

Assuming I have the following models:

public class EditorViewModel
{
  public Account Account {get;set;}
  public string SomeSimpleStuff {get;set;}
}

public class Account
{
  public string AccountName {get;set;}
  public int MorePrimitivesFollow {get;set;}
}

and a view that extends ViewPage<EditorViewModel> which does the following:

<%= Html.TextBoxFor(model => model.Account.AccountName)%>
<%= Html.ValidationMessageFor(model => model.Account.AccountName)%>
<%= Html.TextBoxFor(model => model.SomeSimpleStuff )%>
<%= Html.ValidationMessageFor(model => model.SomeSimpleStuff )%>

and my controller looks like:

[HttpPost]
public virtual ActionResult Edit(EditorViewModel account)
{ /*...*/ }

How can I get the DefaultModelBinder to properly bind my EditorViewModel? Without doing anything special, I get an empty instance of my EditorViewModel with everything null or default.

The closest I've come is by calling UpdateModel manually:

[HttpPost]
public virtual ActionResult Edit(EditorViewModel account)
{
    account.Account = new Account();
    UpdateModel(account.Account, "Account");
    // this kills me:
    UpdateModel(account);

This successfully updates my Account property model, but when I call UpdateModel on account (to get the rest of the public properties of my EditorViewModel) I get the completely unhelpful "The model of type ... could not be updated." There is no inner exception, so I can't figure out what's going wrong.

What should I do with this?